WO2015112676A1 - Système de présence et de classification d'occupant - Google Patents

Système de présence et de classification d'occupant Download PDF

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Publication number
WO2015112676A1
WO2015112676A1 PCT/US2015/012389 US2015012389W WO2015112676A1 WO 2015112676 A1 WO2015112676 A1 WO 2015112676A1 US 2015012389 W US2015012389 W US 2015012389W WO 2015112676 A1 WO2015112676 A1 WO 2015112676A1
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WO
WIPO (PCT)
Prior art keywords
property
seat
signal
threshold
occupant
Prior art date
Application number
PCT/US2015/012389
Other languages
English (en)
Inventor
Blaine Jerry Dolcetti
Josh Adam Schultz
Dan Nicholas Tabar
Jeffrey Scott Bennett
Original Assignee
Tk Holdings Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tk Holdings Inc. filed Critical Tk Holdings Inc.
Priority to CN201580003334.7A priority Critical patent/CN105848970B/zh
Priority to DE112015000477.7T priority patent/DE112015000477B4/de
Priority to JP2016548163A priority patent/JP6524472B2/ja
Publication of WO2015112676A1 publication Critical patent/WO2015112676A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use

Definitions

  • Vehicle seats may include occupant classification systems to attempt to determine if the seat is occupied by an adult, a child, or no one. Vehicle seats may also include other auxiliary components such as seat heaters, empty seat detectors, and serialization components. Current occupant classification systems use the seat bottom heater to determine occupant classification, which helps in determining whether a protective device (e.g., an airbag) will deploy or not during a crash event.
  • a control algorithm divides the data from the seat bottom heater into two regions to determine occupant classification; the first region indicating that the status is empty or small and the second region indicating that the status is either large or occupied.
  • the seat back heater Similar to the seat bottom heater, the seat back heater also has two regions.
  • the seat back heater is used for object presence classification or seat belt reminder (SBR). Measurements located within the first region indicate that the seat belt reminder will be disabled (i.e. OFF) and measurements in the second region indicate that the seat belt reminder is enabled (i.e. ON).
  • SBR seat belt reminder
  • the seat back heater algorithm also requires input from the occupancy classification status to help with the seat belt reminder status.
  • the occupancy classification status In the event that the occupancy classification status is empty or small and the object presence classification is enabled the occupancy classification status overrides the object presence classification and disables (i.e. OFF) the seat belt reminder. This situation only occurs when the occupancy classification is empty/small or unoccupied otherwise the object presence classification reports its actual classification.
  • FIG. 1 is a schematic cross-section view of a vehicle seat including an occupant classification system according to an exemplary embodiment.
  • FIG. 2 is a chart showing several zones for a seat back sensor corresponding to various occupants of a seat.
  • FIG. 3 is a chart showing several zones for a seat bottom sensor corresponding to various occupants of a seat.
  • FIG. 4 is a table showing an exemplary logic for instructions sent to a vehicle safety system.
  • a vehicle seat 40 is shown according to an exemplary embodiment.
  • One or more seats that are configured to receive an occupant may be provided in a vehicle.
  • the vehicle seat includes a generally horizontal lower portion or seat bottom 42 that is coupled to the vehicle and an upper portion or seat back 41 that extends upward from the rear end of the seat bottom.
  • the seat back 41 may be connected to the seat bottom 42 through a recliner mechanism that allows the seat back to tilt or pivot relative to the seat bottom.
  • Each of the seat bottom and the seat back include a supporting frame, a cushion such as a foam pad that is coupled to the frame, and a trim cover that surrounds the cushion.
  • the trim cover may attach to the foam pad using a suitable fastener (e.g., hook and loop fasteners, hog rings, other attachment methods molded into the foam pad, etc.).
  • the trim cover is also coupled to the frame structure (e.g., with j-clips, etc.) to couple the frame member, the trim cover, and the cushion together.
  • the occupant classification system may generally include a sensor, a shield, and electronics for sensing and classifying the occupancy of the seat.
  • the sensor may be used to provide measurements that correspond to the effect of an object on the sensor due to both the conductivity and weight of the object. Measurements from the sensor may be evaluated to determine the existence of an object or occupant in the seat.
  • the occupant classification system may include or be configured to operate in conjunction with a seat heating system and/or other systems for the seat of the vehicle. Exemplary occupant classification systems are disclosed in U.S. Provisional Patent Application No. 13/633,590 filed October 2, 2012 and U.S. Patent Application No. 14/152,471 filed January 10, 2014. The foregoing applications are incorporated by reference herein.
  • the system disclosed herein may be incorporated into the system disclosed in the application no. 14/152,471, for example. Or, the system disclosed in application no. 14/152,471 may be modified to incorporate the functions and disclosed herein.
  • FIG. 1 An occupant classification system for a vehicle seat having a seat bottom 42 and a seat back 41 is shown in FIG. 1.
  • the occupant classification system includes a first electrode 20 in the seat base or bottom 42, shown as a seat bottom heater or occupant classification (OC) sensor.
  • the heating wire or electrode may also function used as the sensor (i.e., "heater as sensor” or "HAS").
  • the electrode or conductor may be used as a sensing electrode for capacitive or electric field based sensing.
  • the seat bottom sensor may be integrated into another system.
  • the system may also include a conductor or electrode 20 located in the seat back, shown as a seat back heater or occupant presence (OP) sensor. As shown in FIG.
  • the seat may include a heater controller (e.g., heater ECU) 52 to control and regulate the supply of a voltage to the heaters (i.e., electrodes) in the seat bottom and/or the seat back and an electronic control unit (ECU) 51 coupled to the sensors in the seat bottom and/or seat back to detect and categorize an object or occupant in the seat.
  • the ECU 51 may include sensing and measurement circuits.
  • the heater controller 52 and the ECU 1 may be connected in series such that power and/or control signals may be provided to the conductor (i.e., sensing and heater device) by, for example, the heater controller 52 through the ECU 51. While the heater controller and the ECU are shown schematically in FIG. 1 as being provided under the seat bottom, in various embodiments the heater controller and/or the ECU may be provided elsewhere in the vehicle, such as in the vehicle dash, in a center console, etc.
  • the heater and occupant sensing controllers 51, 52 may be integrated into a single controller.
  • the seat may not be a heated seat and may lack components such as heater devices and a heater controller.
  • the system includes an interface 60 to connect to various components such as a power supply, ground and the vehicle controller area network (CAN).
  • CAN vehicle controller area network
  • the system will provide data carried over the CAN via, for example, the CAN-L and CAN-H signals.
  • Each of the electrodes in the seat back and seat bottom may be incorporated into a sensor pad.
  • the sensor pad may include a layered structure.
  • the sensor pad and sensing electrode may be constructed in a variety of ways, and the method of construction is not considered limiting.
  • the sensor pad may be constructed using a rigid or a flexible circuit board using known printed circuit board techniques such as etching or deposition of conductive materials applied to a dielectric substrate.
  • the sensor pad may be the foam cushion or seat pad itself with a discrete conductor, such as a conductive film, sheet or mesh, as the sensing element.
  • the sensing electrode may function as the seat heating element so as to provide a comfortable seating environment for the occupant.
  • a temperature sensor may be disposed near a part of the heating element, which may be used for controlling the temperature of the seat.
  • the controller 52 may include a temperature controller that incorporates a temperature measuring circuit which can receive measurements from the temperature sensor to determine the temperature of the sensor pad and a temperature generating circuit which may provide a signal to the heating element in order to control its operation so that a desired temperature of the seat can be maintained in a closed-loop process.
  • the sensor pad may further include a shielding electrode for shielding the sensing electrode from interference from surrounding conductive components.
  • the occupant classification system may employ a capacitive sensing system sends a time varying voltage out to a single sensing element or sensor.
  • the sensor may for example, be one or both of the electrodes shown in FIG. 1.
  • the system includes a measurement circuit to measure a property such as the loading current (or impedance) to ground from the sensing element by monitoring the voltage signal provided to the sensing conductor or element. This measurement may utilize a signal or property of measure that is representative of the desired property to be measured (i.e., impedance or current).
  • the time varying voltage applied to the sensor could take many shapes, although a preferred shape is a sinusoidal signal at frequencies between about 50 kHz and about 150 kHz.
  • the signal e.g., time varying voltage
  • the controller 51 controls the signal (e.g., time varying voltage) applied to the electrodes in the vehicle seat.
  • the sensing system utilizes a measurement system to measure a property of the signal being provided to the electrodes.
  • the system may utilize a measurement system that measures the in-phase (I) and quadrature (Q) components of the current supplied to the sensing electrode via voltage signal.
  • I and Q measurements need not be made. Instead, for example, the phase and amplitude of the current sent to the sensing electrode could be measured to gain equivalent information.
  • the impedance from the sensing electrode to ground should be characterized such that capacitive components of the impedance affect the measurement differently than the resistive components of the impedance.
  • a corresponding measured signal is provided to a controller or microprocessor preferably located in the ECU 51 of the occupant classification system.
  • the controller may be configured to make an occupant classification determination (see, e.g., FIG. 4).
  • time varying shapes may be used that are not sinusoidal signals. If this is the case, alternative methods of identifying the characteristics of the impedance could be used. For example, square pulses could be sent to the sensing electrode. The current sent out to the sensing electrode could be measured and characteristics such as the peak and rise time of the current pulse could be used to characterize the sensing electrode's impedance to ground. Alternatively, several pulses of different length could be sent out to the sensing electrode. Characteristics of the impedance could be derived by analyzing the relationship between the peak currents and the variation of the current with pulse length. In general, the principles of operation of the capacitive (i.e., electric field) sensor described herein can be the same as described in U.S. Patent Publication No.
  • the seat back sensor is monitored separately from a sensor in the seat bottom to discriminate conductive objects on the seat from occupants. Because the measurement detected by monitoring a signal from the seat back sensor is different for an object in the seat than the measurement from a signal from the seat back sensor for an occupant in the seat, the occupant classification system can utilize the seat back sensor to differentiate between an object and an occupant, both of which may otherwise provide a signal that would trigger a system that only includes a sensor provided in the seat bottom.
  • the occupant classification system may utilize sensed data to provide input to other vehicle systems, such as a vehicle safety system (e.g., an airbag system) or a seat belt reminder (SBR) system.
  • vehicle safety system e.g., an airbag system
  • SBR seat belt reminder
  • the occupant classification system may provide a signal that would cause the airbag system to activate one or more airbags associated with the seat in a collision. If, however, the occupant classification system detects a signal indicating an empty seat or a seat containing an object such as child safety seat, it may provide a signal that would cause the airbag system to deactivate one or more airbags associated with the seat in a collision.
  • a threshold 300 (e.g., a third threshold) is determined establishing a first region and a second region.
  • the threshold 300 is determined using the data points corresponding to an occupant of the seat leaning forward, plus an additional margin.
  • the first region includes signals corresponding to electronic devices, child restraint seats, and an empty seat.
  • the second region includes signals corresponding to other occupants, including a large occupant of the seat leaning forward, a large occupant of the seat touching the frame, a large occupant of the seat on an 11 mm blanket, and all other occupants of the seat.
  • a first threshold 100 and a second threshold 200 are determined establishing a first region, a second region, and a third region.
  • the first threshold or primary threshold 100 is determined using the data points corresponding to an occupant of the seat seated on a blanket having a thickness of 11 mm, plus an additional margin.
  • the second threshold or secondary threshold 200 is determined using the data points corresponding to an occupant of the seat leaning forward, plus an additional margin, similar to the OP threshold described above.
  • the first region includes signals corresponding to electronic devices, child restraint seats, and an empty seat.
  • the second region includes signals corresponding to other occupants, including a large occupant of the seat leaning forward, a large occupant of the seat touching the frame, a large occupant of the seat on an 1 1 mm blanket, and all other occupants of the seat.
  • the third region includes signals corresponding to electronic devices, a large occupant of the seat on an 1 1 mm blanket, and some other occupants.
  • the regions established by the thresholds determined for both the OC sensor and the OP sensor can be used to classify the occupant of the seat and control various related systems, such as the airbag system or the SBPv system.
  • various related systems such as the airbag system or the SBPv system.
  • FIG. 4 One example of a logic table for determining instructions sent to an SBR system by an occupant classification system having both an OC sensor and an OP sensor is shown in FIG. 4.
  • measurements by the OC sensor in region 1 indicate that the seat is occupied by a small occupant or is empty. This may be used to disable an airbag system associated with the seat.
  • Measurements by the OC sensor in region 2 indicate that the seat is occupied by a large occupant. This may be used to activate an airbag system associated with the seat.
  • Measurements by the OC sensor in region 3 are indeterminate and are further classified using measurements by the OP sensor.
  • measurements by the OC sensor in region 1 indicate that the seat is occupied by a small occupant or is empty. This may be used to disable an SBR system associated with the seat.
  • Measurements by the OP sensor in region 2 indicate that the seat is occupied by a large occupant. This may be used to activate an SBR system associated with the seat if the OP sensor also indicates a large occupant.
  • Region 3 of the OP sensor and the OC sensor are utilized to mitigate instances in which an electronic device may cause a misclassification for occupant classification.
  • the algorithm will use the OP measurement to help determine the classification of the occupant. If the OP data is located in region 1, such as with an electronic device, the algorithm classifies the occupant as small/empty and treats it in the same way as an occupant with OC data in region 1. This may occur if the seat contains a conductive device and is either empty otherwise or contains a child in a child restraint system.
  • the algorithm classifies the occupant as large and treats it in the same way as an occupant with OC data in region 2. This may occur if the seat contains a conductive device, but also contains an adult occupant. Once the occupant classification is determined for that measurement, the algorithm will disable the object presence classification from running and will associate the object presence classification to the occupant classification.
  • the airbag system may be disabled. If the OC data is in region 1 (i.e. a small/empty occupant), the airbag system may be enabled. If the OP data is in region 2, the SBR system may also be enabled. The addition of the third region for occupant classification (OC) as well as the input of the seat back heater will provide additional inputs to determine proper classification for both occupant classification and seat belt reminder. When the OC data falls within region 3, the algorithm will then look at the seat back sensor to help determine the classification of the system. The algorithm will also force the status of the SBR system to be determined by the occupant classification status. Therefore if the OP sensor detects a large occupant, then the SBR system is enabled, along with the airbag system. If the OP sensor detects a small or empty occupant, then the SBR system is disabled, along with the airbag system.
  • OC third region for occupant classification
  • the results of the measurements and classifications performed by the OP and OC systems may be provided to a vehicle safety system via a vehicle controller area network (CAN).
  • CAN vehicle controller area network
  • the OC and OP system controller may send data via the CAN to an airbag control module that would indicate that the airbag should be either enabled or disabled according to the algorithm results shown in the table of Fig. 4.
  • the OP and OC system controller may send data via the CAN to a vehicle seat belt reminder (SBR) controller that would indicate whether the SBR should provide an indication to the occupant of the seat to secure a seat belt system.
  • SBR vehicle seat belt reminder
  • the system can properly classify the occupant in the seat and prevent misclassifications due to electronic devices and other variants.
  • the system can provide more a robust classification status, especially with electronic devices and worst case occupant positions (e.g., an occupant seated on a blanket).
  • the system provides for more accurate enabling and disabling of the airbag as well as prevents the seat belt reminder from activating due to the presence of an electronic device on the seat.
  • Using two sensors (e.g., sensing electrodes) located at different positions may reduce any classification issues resulting from an occupant being positioned in a worst case position, therefore improving performance and robustness.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Seats For Vehicles (AREA)
  • Air Bags (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)

Abstract

La présente invention concerne un système de classification d'occupant qui comprend une première électrode de détection située dans la partie inférieure d'un siège de véhicule et une seconde électrode de détection située dans le dossier du siège de véhicule. Le système comprend un contrôleur qui est conçu pour réguler la transmission d'un premier signal vers la première électrode et d'un second signal vers la seconde électrode. L'invention comprend un circuit de mesure qui est conçu pour mesurer une première propriété du premier signal et une seconde propriété du second signal. Le contrôleur est conçu pour classifier un occupant à l'aide des première et seconde propriétés.
PCT/US2015/012389 2014-01-23 2015-01-22 Système de présence et de classification d'occupant WO2015112676A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201580003334.7A CN105848970B (zh) 2014-01-23 2015-01-22 乘员的存在和分类系统
DE112015000477.7T DE112015000477B4 (de) 2014-01-23 2015-01-22 Insassenanwesenheits- und Klassifizierungssystem
JP2016548163A JP6524472B2 (ja) 2014-01-23 2015-01-22 車両用の乗員識別システム、並びに車両用の乗員識別およびシートヒータシステム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201461930893P 2014-01-23 2014-01-23
US61/930,893 2014-01-23

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WO2015112676A1 true WO2015112676A1 (fr) 2015-07-30

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US (1) US9511732B2 (fr)
JP (1) JP6524472B2 (fr)
CN (1) CN105848970B (fr)
DE (1) DE112015000477B4 (fr)
WO (1) WO2015112676A1 (fr)

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Also Published As

Publication number Publication date
JP2017503714A (ja) 2017-02-02
CN105848970B (zh) 2018-08-17
CN105848970A (zh) 2016-08-10
US9511732B2 (en) 2016-12-06
JP6524472B2 (ja) 2019-06-05
DE112015000477T5 (de) 2016-10-06
DE112015000477B4 (de) 2021-08-26
US20150203064A1 (en) 2015-07-23

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